The mechanical characterization of low work hardening, high strength steel

Scott, R.I. and Hodgson, Peter 2005, The mechanical characterization of low work hardening, high strength steel, Journal of ASTM International, vol. 2, no. 9, pp. 1-15.

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Title The mechanical characterization of low work hardening, high strength steel
Author(s) Scott, R.I.
Hodgson, Peter
Journal name Journal of ASTM International
Volume number 2
Issue number 9
Start page 1
End page 15
Publisher ASTM International
Place of publication West Conshohocken, PA
Publication date 2005
ISSN 1546-962X
Keyword(s) elastic limit
high strength steels
Lüders band
mechanical properties
recovery annealed steel
strain measurement
tensile testing
Summary One of the major challenges in assessing the mechanical properties of recovery annealed steel is the strain localization that occurs almost immediately on the formation of the first Lüders band, such that no or limited propagation of the Lüders band occurs along the tensile coupon. The stress raiser associated with the geometry of the standard tensile coupon means that this plastic deformation is often completely outside the standard extensometers on the coupon. Hence, no strain is measured during the test. While this is not important for assessing the tensile strength of the steel, it does mean that the strain related properties, such as the elastic limit of the steel, cannot be measured using standard testing techniques.This work addresses this issue by examining three techniques for ensuring that the strain occurs inside the extensometer. It is shown that the best technique is the extended extensometer, where the gauge length covers slightly more than the tensile coupon parallel length. While this leads to some variation in the width of the material being measured, compensation can be be made by adjusting the strain to correct the Young's Modulus.This technique has direct implications not just for recovery annealed steels, but for other high strength, low work hardening materials such as ultrafine ferrite. A particular requirement of these high strength steels in structural applications is a high elastic limit; hence, measurement of the strain related properties for these high strength materials must be considered vital in their mechanical assessment.
Language eng
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 870302 Metals (e.g. Composites, Coatings, Bonding)
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2005, ASTM International
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